Re: smtp with ip filter .. become slow

This is a discussion on Re: smtp with ip filter .. become slow within the IPFilter forums, part of the System Security and Security Related category; Quoting . (el-fajari@solocyber.com): > Hi. I am using ipfilter for mail server, but I got little problem because ...


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Old 12-01-2003
Chuck Yerkes
 
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Default Re: smtp with ip filter .. become slow

Quoting . (el-fajari@solocyber.com):
> Hi. I am using ipfilter for mail server, but I got little problem because of
> it's performance.
> If I send a email it's look like very slow, I was read FAQ and I also add :
>
> block return-rst in quick on ppp0 proto tcp from any to any port = 113
>
> but it's still slow, here is complate rules in ipf.conf :
> block in log quick all with short
> block in log quick all with opt lsrr
> block in log quick all with opt ssrr
> pass in on lo0 all
> pass out on lo0 all



Wow, how annoying to have your "real name" be set as "."

debugging tools:
sniff the network. (snoop, tcpdump, etc).

Does it send out a DNS query (or 5) and wait 30 seconds per?
What's the mail process in the middle of while it hangs.



80% of the time it's about DNS.
It *might* be about ident, but something is going out
and waiting for a timeout.
It's doubtfully anything to do with ipfilter.

I might take ipfilter down long enough to send a message
and see if it's different.

If it IS, then start looking at (perhaps removing) each rule

reply to the list, not me. And fix that "."
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